He said: "Mark used to stay in Tollcross in the east end of Glasgow and from our enquiries so far, we believe that he may be in that area, however, he hasn’t turned up for work this week and no one has seen or heard from him since Sunday which is unusual.

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“He has friends in the Tollcross area and tends to socialise in the pubs there. Officers have been checking those pubs, as well as CCTV and speaking with friends and family but so far no trace of him which is concerning for us and his family who he keeps in touch with when out and about.

“When he left home he drove off in his car, a black Vauxhall Corsa with the registration number Y626AGG.

"We know he has access to money but he doesn’t appear to have a mobile with him.